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POReturning an int from native function(c++, jni) crashes application
 

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  1. POReturning an int from native function(c++, jni) crashes application
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    <p>Trying to figure out why c++ function call returning an int crashes the whole application without any errors/warnings.</p> <p>Here is working code:</p> <pre><code> jint Java_org_ntorrent_DummyTorrentInfoProvider_next( JNIEnv * env, jobject obj, jint number) { jint test = rand(); __android_log_print(ANDROID_LOG_DEBUG, "HelloNDK!", "rand() = %d", test); return number; } </code></pre> <p>And this code crashes application without warnings:</p> <pre><code> jint Java_org_ntorrent_DummyTorrentInfoProvider_next( JNIEnv * env, jobject obj, jint number) { jint test = rand(); __android_log_print(ANDROID_LOG_DEBUG, "HelloNDK!", "rand() = %d", test); return number + test; } </code></pre> <p>Before the application crashes i can see my log message(__android_log_print) in log cat</p> <p>EDIT: Even if I replace "number + test" with "1" the application still crashing... It only works if I return "number"...</p> <p>EDIT#2: Java-side code:</p> <pre><code> package org.ntorrent; import java.util.ArrayList; import java.util.Random; public class DummyTorrentInfoProvider implements TorrentInfoProvider { public native Integer next(Integer number); //public Integer next() { return _random.nextInt(); } public native void test(); private Random _random = new Random(100); @Override public ArrayList getTorrents() { test(); ArrayList torrents = new ArrayList(); torrents.add( new TorrentInfo("test torrent number 1", next(1), 3f, 5f)); torrents.add( new TorrentInfo("test torrent number 2", next(2), 4f, 15f)); torrents.add( new TorrentInfo("test torrent number 555")); torrents.add( new TorrentInfo("test torrent number 3", next(3), 13f, 5f)); return torrents; } static { System.loadLibrary("test"); } } </code></pre>
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    1. COstack smash, or other kind of memory problems?
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    2. COGet a dump from the JVM and look what exactly is happening. Under Hotspot there are options to debug these problems - no idea about android though. The code here is fine, the problem is elsewhere.
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    3. COThanks for quick responses, guys! I'll try that tomorrow...
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